This final thesis presents the development of simple tools to manually mark a region of interest on certain sequences of collection of sagittal section images of knee obtained by magnetic resonance imaging and also manually selecting a region of interest on all sequences and saving the result in a database for further use. Each sequence of is composed of a set of lobes that are presented by DICOM images. Final thesis describes the development of the code and its functions, used hardware and software, the process of marking the region of interes and the anatomy of the human knee.